LED Probe

a year ago

The LED Probe is a simple tester for through-hole or surface-mount LEDs, automatically showing their polarity.
Two versions were built: one based on ATtiny85 and another on ATtiny202 for performance comparison.
Features include small size, no current draw when idle, polarity indication, and compatibility with various LED types.
The tester works by applying a voltage across the LED and swapping polarity every 10 milliseconds.
It can detect open circuits, short circuits, and LED polarity, indicated by a bi-colour LED.
The device goes to sleep after 60 seconds of inactivity, consuming less than 0.2µA.
Compatible with a wide range of LEDs but may not work with novelty or circuit-embedded LEDs.
Construction involves surface-mount components soldered using a hotplate, with options for different LED indicators.
Power is provided by a CR2032 coin cell, with considerations for safety and battery type.
Programming involves specific steps for ATtiny85 and ATtiny202 versions, with resources available on GitHub.

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